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Java > Open Source Codes > org > springframework > orm > hibernate3 > TransactionAwareDataSourceConnectionProvider


1 /*
2  * Copyright 2002-2005 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */

16
17 package org.springframework.orm.hibernate3;
18
19 import javax.sql.DataSource JavaDoc;
20
21 import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;
22
23 /**
24  * Subclass of LocalDataSourceConnectionProvider that returns a
25  * transaction-aware proxy for the exposed DataSource. Used if
26  * LocalSessionFactoryBean's "useTransactionAwareDataSource" flag is on.
27  *
28  * @author Juergen Hoeller
29  * @since 1.2
30  * @see LocalSessionFactoryBean#setUseTransactionAwareDataSource
31  */

32 public class TransactionAwareDataSourceConnectionProvider extends LocalDataSourceConnectionProvider {
33
34     /**
35      * Return a TransactionAwareDataSourceProxy for the given DataSource,
36      * provided that it isn't a TransactionAwareDataSourceProxy already.
37      */

38     protected DataSource JavaDoc getDataSourceToUse(DataSource JavaDoc originalDataSource) {
39         if (originalDataSource instanceof TransactionAwareDataSourceProxy) {
40             return originalDataSource;
41         }
42         return new TransactionAwareDataSourceProxy(originalDataSource);
43     }
44
45     /**
46      * This implementation returns <code>true</code>: We can guarantee
47      * to receive the same Connection within a transaction, as we are
48      * exposing a TransactionAwareDataSourceProxy.
49      */

50     public boolean supportsAggressiveRelease() {
51         return true;
52     }
53
54 }
55
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